CN103590050A - Carburizing and quenching method for worm part - Google Patents

Carburizing and quenching method for worm part Download PDF

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Publication number
CN103590050A
CN103590050A CN201310627319.2A CN201310627319A CN103590050A CN 103590050 A CN103590050 A CN 103590050A CN 201310627319 A CN201310627319 A CN 201310627319A CN 103590050 A CN103590050 A CN 103590050A
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China
Prior art keywords
carburizing
quenching
worm screw
worm
tooth
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CN201310627319.2A
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CN103590050B (en
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李泉
余学华
杨鑫锐
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Chongqing Qingping Machinery Factory
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Chongqing Qingping Machinery Factory
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Abstract

The invention discloses a carburizing and quenching method for a worm part. The worm part is made of 20CrNiMo steel. The method comprises the following steps: A, processing the excircle and the tooth part of the worm part, wherein allowance is left to the excircle; B, subjecting the integral worm part to carburizing and slow cooling; C, removing the allowance of the excircle; D, subjecting the integral worm part to micro-scale carburizing and quenching; and E, carrying out surface processing on the worm part so as to obtain a finished product. The carburizing and quenching method for the worm part discards the conventional process that carries out anti-carburizing treatment on the excircle surface except the tooth part of the worm part by using an anti-carburizing paint, eliminates negative influence on the cooling speed and hardenability of the product during quenching and enables hardness of the tooth surface and the excircle surface of the worm part to meet processing requirements.

Description

Worm screw part carburization quenching method
Technical field
The present invention relates to a kind of heat treating method, relate in particular to a kind of worm screw part carburization quenching method.
Background technology
20CrNiMo is a kind of low-carbon alloy structural steel that gear is manufactured that is widely used in, there is good welding property and cold strain plasticity, generally by modified or carburizing and quenching, improve Integrated using performance, for worm screw part, conventionally require its tooth face hardness to reach 56-62HRC, effective hardened layer 1.80-2.20mm, periphery except the flank of tooth need be done antiseepage and process, hardness requirement is 30-45HRC, therefore in order to make worm screw part reach processing request, the general treatment process that all adopts carburizing and quenching, in prior art, when the carburizing and quenching of worm screw part is processed, in the excircle part except the flank of tooth, being coated with masking paste protects, according to GB/T6141.3-92, product metallographic structure is qualified, worm screw part tooth face hardness is 57-58HRC, the cylindrical hardness of antiseepage is 17-18HRC, from assay, antiseepage part cylindrical hardness does not reach processing request, through metallographic, detect, the tissue of product is ferrite and pearlite substantially, in as-annealed condition, its reason is that masking paste has had a strong impact on speed of cooling and hardening capacity when product quenches.
Therefore, for addressing the above problem, need a kind of worm screw part carburization quenching method, make the tooth face hardness of worm screw part and periphery hardness all can reach processing request.
Summary of the invention
In view of this, the object of this invention is to provide a kind of worm screw part carburization quenching method, abandoned the available technology adopting masking paste method that the periphery except tooth portion carries out antiseepage processing to worm screw part, eliminated speed of cooling when product is quenched and the negative impact of hardening capacity, made the tooth face hardness of worm screw part and periphery hardness all can reach processing request.
Worm screw part carburization quenching method, described worm screw part material is 20CrNiMo steel, the method comprises the following steps: A. machining worm part outer and tooth portion, wherein cylindrical made allowance; B. the whole carburizing treatment of worm screw part slow cooling; C. remove cylindrical surplus; D. the whole micro-carburizing and quenching of worm screw part is processed; E. worm screw part is carried out to surface working to finished product;
Further, in described step B, the carbon potential of carburizing treatment is 1.25-1.10%, and carburizing temperature is 930 ℃, and carburizing time is 400min, and case depth is 1.0-1.2mm, and the slow cooling time is 90min;
Further, in described steps A, staying monolateral surplus is 3.0-3.5mm;
Further, when in the step D of institute, micro-carburizing and quenching is processed, in stove, carbon potential is 0.70-0.72%, and the cool time is 108-112 minute, and quenching temperature is 878-882 ℃, and depth of hardening is 1.0-1.3mm;
Further, in described step e, surface working mode is cylindrical grinding.
Worm screw part carburization quenching method of the present invention, abandoned the available technology adopting masking paste method that the periphery except tooth portion carries out antiseepage processing to worm screw part, eliminated speed of cooling when product is quenched and the negative impact of hardening capacity, made the tooth face hardness of worm screw part and periphery hardness all can reach processing request.
Embodiment
The worm screw part carburization quenching method of the present embodiment, described worm screw part material is 20CrNiMo steel, the method comprises the following steps: A. machining worm part outer and tooth portion, wherein cylindrical made allowance; B. the whole carburizing treatment of worm screw part slow cooling; C. remove cylindrical surplus; D. the whole micro-carburizing and quenching of worm screw part is processed; E. worm screw part is carried out to surface working to finished product.
In the present embodiment, in described step B, the carbon potential of carburizing treatment is 1.25-1.10%, and carburizing temperature is 930 ℃, and carburizing time is 400min, and case depth is 1.0-1.2mm, and the slow cooling time is 90min; Under this condition, carburizing treatment can make worm screw part obtain top layer high-carbon, pass through afterwards quench treatment, make the top layer of workpiece there is high rigidity and wear resistance, and the centre portions of workpiece is still keeping toughness and plasticity before carburizing, by processing with upper type, can meet mechanical workout, can make anti-carburizing treatment to antiseepage treating part again.
In the present embodiment, in described steps A, staying monolateral surplus is 3.0-3.5mm; Under the car-burization condition of step B, can permeate this surplus layer and make the micro-carburizing state of its inner formation, after removal surplus, by follow-up quench treatment, can meet the requirements of surface hardness, than prior art, can increase the service life; In step C, get rid of the cylindrical surplus that is less than 2.5mm, residue surplus part is removed during surface working in step e.
In the present embodiment, when in the step D of institute, micro-carburizing and quenching is processed, in stove, carbon potential is 0.70-0.72%, and the cool time is 108-112 minute, and quenching temperature is 878-882 ℃, and depth of hardening is 1.0-1.3mm; Under this condition, quench treatment can significantly improve intensity, hardness, wear resistance, fatigue strength and the toughness of worm screw part, improve the twisting strength of worm screw part, extend its work-ing life, quench and adopt the C of 0.7% left and right to carry out micro-carburetting processing, during quenching, both kept core toughness, the part hardness of antiseepage increases again, strengthens wear-resistant and don't increase fragility.
In the present embodiment, in described step e, surface working mode is cylindrical grinding, and the process redundancy of ground finish is few, is convenient to control product size precision; Working accuracy is high simultaneously, and general grinding can obtain IT5-7 class precision, and surfaceness can reach Ra0.2-1.6um, can make product reach processing request.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims (5)

1. a worm screw part carburization quenching method, described worm screw part material is 20CrNiMo steel, it is characterized in that: comprise the following steps: A. machining worm part outer and tooth portion, wherein cylindrical made allowance; B. the whole carburizing treatment of worm screw part slow cooling; C. remove cylindrical surplus; D. the whole micro-carburizing and quenching of worm screw part is processed; E. worm screw part is carried out to surface working to finished product.
2. worm screw part carburization quenching method according to claim 1, it is characterized in that: in described step B, the carbon potential of carburizing treatment is 1.25-1.10%, carburizing temperature is 930 ℃, and carburizing time is 400min, case depth is 1.0-1.2mm, and the slow cooling time is 90min.
3. worm screw part carburization quenching method according to claim 2, is characterized in that: in described steps A, staying monolateral surplus is 3.0-3.5mm.
4. worm screw part carburization quenching method according to claim 1, it is characterized in that: when in the step D of institute, micro-carburizing and quenching is processed, in stove, carbon potential is 0.70-0.72%, cool time is 108-112 minute, and quenching temperature is 878-882 ℃, and depth of hardening is 1.0-1.3mm.
5. worm screw part carburization quenching method according to claim 1, is characterized in that: in described step e, surface working mode is cylindrical grinding.
CN201310627319.2A 2013-11-29 2013-11-29 Worm part carburization quenching method Active CN103590050B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105118730A (en) * 2015-09-19 2015-12-02 宁波铭德电气科技有限公司 Vacuum circuit breaker with long service life
CN106594231A (en) * 2016-12-19 2017-04-26 大大科技(宁国)有限公司 Worm wheel jack
CN107236847A (en) * 2017-07-31 2017-10-10 世通海泰泵业(天津)股份有限公司 A kind of processing technology of hydraulic pump worm screw
CN107313002A (en) * 2017-05-15 2017-11-03 滁州亿扬零部件制造有限公司 A kind of worm tooth wheel shaft heat treatment processing method
CN110408882A (en) * 2019-08-26 2019-11-05 山东亨格尔制造有限责任公司 A kind of anti-carburizi ng processing method

Citations (1)

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Publication number Priority date Publication date Assignee Title
CN103341743A (en) * 2013-07-08 2013-10-09 河北华北柴油机有限责任公司 Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove

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CN103341743A (en) * 2013-07-08 2013-10-09 河北华北柴油机有限责任公司 Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove

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刘园园等: ""大模数齿轮用钢及热处理"", 《机械》, vol. 31, 31 December 2004 (2004-12-31), pages 147 - 148 *
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105118730A (en) * 2015-09-19 2015-12-02 宁波铭德电气科技有限公司 Vacuum circuit breaker with long service life
CN106594231A (en) * 2016-12-19 2017-04-26 大大科技(宁国)有限公司 Worm wheel jack
CN107313002A (en) * 2017-05-15 2017-11-03 滁州亿扬零部件制造有限公司 A kind of worm tooth wheel shaft heat treatment processing method
CN107236847A (en) * 2017-07-31 2017-10-10 世通海泰泵业(天津)股份有限公司 A kind of processing technology of hydraulic pump worm screw
CN110408882A (en) * 2019-08-26 2019-11-05 山东亨格尔制造有限责任公司 A kind of anti-carburizi ng processing method

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